Jamie Arnold vs. Onan Masaoka — Career Comparison

Looking at the career totals, Jamie Arnold and Onan Masaoka are fairly close on the surface numbers. Onan Masaoka posted stronger numbers in ERA (4.23 vs 5.73) and WHIP (1.537 vs 1.652). Jamie Arnold had the advantage in home runs allowed (0.58 per nine innings vs 0.96). By the career numbers, Onan Masaoka had the better of this comparison — though ERA and WHIP alone don't account for era, park factors, or the defenses each pitcher worked behind.